[Qemu-devel] Question about memory micro operations in Qemu 0.12.x

[Qemu-devel] Question about memory micro operations in Qemu 0.12.x

[coopht]

Hello.
in qemu 0.9.x there was a special file with micro-operations, which 
implemented access to memory. For example for arm architecture it was 
op_mem.h file. I was able to add some printfs to this functions and get 
information about memory accesses.

My question is : how memory access microoperations are now implemented 
in qemu 0.12.x ?

Thanks for you answers.

[Qemu-devel] Question about memory micro operations in Qemu 0.12.x

[coopht]

Hello.
in qemu 0.9.x there was a special file with micro-operations, which 
implemented access to memory. For example for arm architecture it was 
op_mem.h file. I was able to add some printfs to this functions and get 
information about memory accesses.

My question is : how memory access microoperations are now implemented 
in qemu 0.12.x ?

Thanks for you answers.

Re: [Qemu-devel] Question about memory micro operations in Qemu 0.12.x

[Stuart Brady]

On Sat, Mar 27, 2010 at 09:20:51AM +0300, coopht@gmail.com wrote:
> My question is : how memory access microoperations are now
> implemented in qemu 0.12.x ?

We heard you the first time. :-)

Cheers,
-- 
Stuart Brady

Re: [Qemu-devel] Question about memory micro operations in Qemu 0.12.x

[Alexander]

Thank you for your answer.

I still have some questions.

27.03.2010 12:49, Stuart Brady пишет:
> On Fri, Mar 26, 2010 at 11:23:30PM +0300, coopht@gmail.com wrote:
>    
>> Hello.
>> in qemu 0.9.x there was a special file with micro-operations, which
>> implemented access to memory. For example for arm architecture it
>> was op_mem.h file. I was able to add some printfs to this functions
>> and get information about memory accesses.
>>
>> My question is : how memory access microoperations are now
>> implemented in qemu 0.12.x ?
>>
>> Thanks for you answers.
>>      
> To generate load and store operations, tcg_gen_qemu_{ld,st}*() are now
> used.  See tcg/README for more information on TCG ops.
>
> In tcg/*/tcg-target.c, you'll find tcg_out_qemu_{ld,st}().  The easiest
> way to do this would probably be to place your printfs in __ld_mmu() and
> __st_mmu() (which are defined via softmmu_template.h), and remove the
> TLB lookups from tcg_out_qemu_{ld,st}() so that your tracing code is
> always called.
>    

1. How can I remove TLB lookups from tcg_out_qemu_{ld,st} ?

> Instead of modifying tcg_out_qemu_{ld,st}(), you might also be able to
> bypass it entirely, by using having tcg_gen_qemu_{ld,st}*() generate
> calls to a helper function.
>    
2. Can you give me some examples of it ?
> Cheers,
>    

Thanks for your help.